package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.google.gson.JsonObject;

import DB.CouchDB;

public class Login extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public Login() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String path = request.getContextPath();
		String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
		
		
		
		HttpSession session = request.getSession(true);
		
		String email = request.getParameter("email");
		String passwd = request.getParameter("password");
		JsonObject  object = new JsonObject ();
		
		// check the email
		if (email!=null && Utility.mail.validEmail(email)) {
			// none cookie, create a new cookie
			CouchDB db = new CouchDB();
			// check the if the input is right
			if(!db.checkUserExist(email)){
				session.invalidate();
				object.addProperty("message","this email has not been registed either!");
			}
			else{
				if (!db.checkUserPasswd(email, passwd)) {
					session.invalidate();
					object.addProperty("message","either user name or password is wrong, please check");
					}
			// 
				else {		
					String token = Utility.Base64.EncoderBase64(email);
					session.setAttribute( "email", email);
					session.setAttribute( "token", token);

					object.addProperty("message","redirect");
				}
			} 
		}
			
		else{
			session.invalidate();
			object.addProperty("message","invalid email address, please check");
		}
		response.setContentType("application/json");
		PrintWriter out = response.getWriter();
		out.print(object);
		out.flush();
		out.close();
	}
	
	
	
	
	/**
	 * add new cookie for register user
	 * @param email
	 * @param response
	 */
	public void addNewSession(String email, String token, HttpSession session){
		session.setAttribute( "email", email );
		session.setAttribute("token", token);
	}
	

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
